power: vm-bms: Use ACC based logic to calculate SOC

The apparent charge capacity (ACC) is used to determine
the UUC (unusable capacity) at a particular cutoff voltage which
is used to calculate the user reported SOC(state of charge).

This requires the ibat_vs_temp_vs_acc LUT in the battery
profile.

CRs-Fixed: 639623
Change-Id: I818af32f41267ebbeb693d6ebe8461e568fbbb4d
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>